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Practice Questions: Time & Work Video Lecture - CAT
FAQs on Practice Questions: Time & Work Video Lecture - CAT
| 1. What is the basic formula to calculate work done when involving time and work problems? |  |
Ans. The basic formula to calculate work done is Work = Rate × Time. In time and work problems, if one person can complete a job in 'x' days, their work rate is 1/x of the job per day. If multiple people are working together, their combined work rates are added together to determine how long it will take them to complete the job.
| 2. How do you determine the time taken by two or more people working together on a task? | |
Ans. To determine the time taken by two or more people working together, first calculate their individual work rates. Then, add these rates together to get the combined work rate. The time taken to complete the task is then found by dividing the total work (usually taken as 1 job) by the combined work rate.
| 3. What is the concept of "work rate" in time and work problems? | |
Ans. The concept of "work rate" refers to the amount of work done by a person or group in a given time period. It is often expressed as a fraction of the total work that can be completed in one unit of time (e.g., one day). For example, if a worker can finish a job in 4 days, their work rate is 1/4 of the job per day.
| 4. Can you explain how to solve problems involving different work rates of individuals? | |
Ans. To solve problems with different work rates, first identify the work rates of each individual or group. Convert their times to work rates (e.g., if one person can complete a job in 2 days, their rate is 1/2). Then, use these rates to find the combined rate if they work together, or determine how the work is divided if they work separately.
| 5. What are some common traps or mistakes to avoid in time and work problems? | |
Ans. Common mistakes include not converting all times into the same unit (e.g., days vs. hours), forgetting to add or subtract work rates correctly, and misinterpreting the total work involved. It's also easy to miscalculate the total time needed when combining different work rates, so careful attention to detail is crucial.
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Feb 11, 2026 Last updated
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